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looks like some good info in those links, Ill have to read those when i get some free time.

For the most part i just look for splits, This is very common on pure tungsten, Espicaily if running on the upper end of amps compared to size, I also make sure its clean, Pure gets contaiminated even if you dont touch anything, And i never weld with a dirty tungsten, if i hit it or even the lightest touch i stop and resharpen it, even cut that part off most the time. As far as types i think its alot of preference, I actually like 2% thoriated the best for aluminum, you can run more amps with them(size for size compared to pure) before they start splitting and resist contamination way more than pure. Also look for colors, if see any gold or blue your post flow is set to low and is losing sheild before it gets a chance to cool. Ive had good luck with the rare earth ones too (grey) If the radioactive thing bothers ya

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also as H80N said, proper sharpening and prep is probly the most important, And always use one grinding wheel dedicated to tungsten, I also noticed when i used to break the tungsten to size, it causes it to split. i no longer do this, just use grinder to cut them off.

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I perfer to use a 120 grit sanding wheel, it leaves less lines then a grinder wheel would.

I would search these forums and read all about the color people use and WHY they use them. Everyone has their own opinions on tungsten, it is your job to figure out which one is best for you. You can't have someone teach you to weld, you must weld yourself to be taught.